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186

Fitter s Tools.

Of Centre Punches two are required, the larger for mark-
ing main centres only, and the smaller, or Dotting Punch, for the
purpose of making a scribed line more lasting and apparent, by
marking a series of punches or £ dots' along its length.

A light crane arm and Weston block is also of use when work
of large size is to be manipulated.

^ Fitter's Tools.óMost fitting is done at the bench, the
work being gripped in a vice, of which there are two principal
kinds, 'Leg' and 'Parallel/ The old-fashioned Leg Vice,
made of wrought iron with steel-faced jaws, is still considerably
used, because capable of withstanding a large amount of hard